More info about environments added to the alerts page and alerts modal

[samejr]

Alerts table

• Added environments labels
• Improved the icons for enabled/disabled

Alerts modal

• Added Environments section with default selected and disabled options
• Added a tooltip to explain when you receive alerts
• Made the copy a bit friendlier and more obvious

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[ericallam]

I think we shouldn't have the environment options there until we actually implement those. It will make the form seem broken.